Rewrite XML doc comments for consistency across the solution (#150)

XML comments were inconsistent: abbreviated inline param/exception docs
mixed with full expanded blocks, missing `<typeparam>` on generic types,
empty `<exception>` tags, broken `<see cref>` and `<paramref>`
references, a missing copyright header, and a typo.

## Changes

- **`AbstractPolylineDecoder`** — Added `<typeparam>` docs; expanded the
abbreviated `Decode(polyline, CancellationToken)` overload to full form
including `OperationCanceledException`; added `<param>`/`<exception>` to
`ValidateFormat`; added full docs to abstract `GetReadOnlyMemory` and
`CreateCoordinate`; simplified private helper summaries to single
sentences
- **`AbstractPolylineEncoder`** — Added `<typeparam>` docs; removed
incorrect `<exception cref="InternalBufferOverflowException"/>` (wrong
type); added description to empty `<exception
cref="InvalidOperationException"/>`
- **`PolylineEncodingOptionsBuilder`** — Standardized all three builder
`<returns>` to `"The current PolylineEncodingOptionsBuilder instance for
method chaining."`; simplified `WithPrecision` summary
- **`PolylineEncoding`** — Removed stale `<paramref name="rounding"/>`
(no such parameter on `Normalize`); fixed `<see cref="GetCharCount"/>` →
`<see cref="GetRequiredBufferSize"/>`
- **`PolylineEncoderExtensions`** — Added missing copyright header;
added `<typeparam>` docs; updated method summaries/returns to reference
`TCoordinate`/`TPolyline` rather than concrete types; added
`<exception>` for null `coordinates`
- **`PolylineDecoderExtensions`** — Added `<exception
cref="ArgumentNullException">` for null `polyline` on `string` and
`char[]` overloads
- **`CoordinateDelta`** — Removed blank lines between closing doc tags
and method declarations; moved second `<summary>` sentence to
`<remarks>`
- **`Defaults`** — Added missing `<summary>` on `Coordinate` nested
class; fixed typo `"vakues"` → `"values"`; added missing trailing period

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: petesramek <2333452+petesramek@users.noreply.github.com>

Author: Copilot

src/PolylineAlgorithm/Abstraction/AbstractPolylineDecoder.cs

@@ -12,12 +12,14 @@
 
 namespace PolylineAlgorithm.Abstraction {
     /// <summary>
-    /// Decodes encoded polyline strings into sequences of geographic coordinates.
-    /// Implements the <see cref="IPolylineDecoder{TPolyline, TCoordinate}"/> interface.
+    /// Provides a base implementation for decoding encoded polyline strings into sequences of geographic coordinates.
     /// </summary>
     /// <remarks>
-    /// This abstract class provides a base implementation for decoding polylines, allowing subclasses to define how to handle specific polyline formats.
+    /// Derive from this class to implement a decoder for a specific polyline type. Override <see cref="GetReadOnlyMemory"/>
+    /// and <see cref="CreateCoordinate"/> to provide type-specific behavior.
     /// </remarks>
+    /// <typeparam name="TPolyline">The type that represents the encoded polyline input.</typeparam>
+    /// <typeparam name="TCoordinate">The type that represents a decoded geographic coordinate.</typeparam>
     public abstract class AbstractPolylineDecoder<TPolyline, TCoordinate> : IPolylineDecoder<TPolyline, TCoordinate> {
         private readonly ILogger<AbstractPolylineDecoder<TPolyline, TCoordinate>> _logger;
 
@@ -34,7 +36,7 @@ protected AbstractPolylineDecoder()
         /// The <see cref="PolylineEncodingOptions"/> to use for encoding operations.
         /// </param>
         /// <exception cref="ArgumentNullException">
-        /// Thrown when <paramref name="options"/> is <see langword="null" />
+        /// Thrown when <paramref name="options"/> is <see langword="null"/>.
         /// </exception>
         protected AbstractPolylineDecoder(PolylineEncodingOptions options) {
             if (options is null) {
@@ -74,14 +76,30 @@ public IEnumerable<TCoordinate> Decode(TPolyline polyline)
             => Decode(polyline, CancellationToken.None);
 
         /// <summary>
-        /// Decodes an encoded polyline with cancellation support.
+        /// Decodes an encoded <typeparamref name="TPolyline"/> into a sequence of <typeparamref name="TCoordinate"/> instances,
+        /// with support for cancellation.
         /// </summary>
-        /// <param name="polyline">The encoded polyline.</param>
-        /// <param name="cancellationToken">Cancellation token.</param>
-        /// <returns>Decoded coordinates.</returns>
-        /// <exception cref="ArgumentNullException"/>
-        /// <exception cref="ArgumentException"/>
-        /// <exception cref="InvalidPolylineException"/>
+        /// <param name="polyline">
+        /// The <typeparamref name="TPolyline"/> instance containing the encoded polyline string to decode.
+        /// </param>
+        /// <param name="cancellationToken">
+        /// A <see cref="CancellationToken"/> that can be used to cancel the decoding operation.
+        /// </param>
+        /// <returns>
+        /// An <see cref="IEnumerable{T}"/> of <typeparamref name="TCoordinate"/> representing the decoded latitude and longitude pairs.
+        /// </returns>
+        /// <exception cref="ArgumentNullException">
+        /// Thrown when <paramref name="polyline"/> is <see langword="null"/>.
+        /// </exception>
+        /// <exception cref="ArgumentException">
+        /// Thrown when <paramref name="polyline"/> is empty.
+        /// </exception>
+        /// <exception cref="InvalidPolylineException">
+        /// Thrown when the polyline format is invalid or malformed at a specific position.
+        /// </exception>
+        /// <exception cref="OperationCanceledException">
+        /// Thrown when <paramref name="cancellationToken"/> is canceled during decoding.
+        /// </exception>
         public IEnumerable<TCoordinate> Decode(TPolyline polyline, CancellationToken cancellationToken) {
             const string OperationName = nameof(Decode);
 
@@ -124,11 +142,9 @@ public IEnumerable<TCoordinate> Decode(TPolyline polyline, CancellationToken can
 
         /// <summary>
         /// Validates that the provided polyline is not <see langword="null"/>.
-        /// Throws an <see cref="ArgumentNullException"/> if the polyline is <see langword="null"/>.
-        /// Optionally logs a warning if a logger is provided.
         /// </summary>
         /// <param name="polyline">The polyline instance to validate.</param>
-        /// <param name="logger">Optional logger for diagnostic messages.</param>
+        /// <param name="logger">An optional <see cref="ILogger"/> used to log a warning when validation fails.</param>
         /// <exception cref="ArgumentNullException">
         /// Thrown when <paramref name="polyline"/> is <see langword="null"/>.
         /// </exception>
@@ -141,12 +157,10 @@ private static void ValidateNullPolyline(TPolyline polyline, ILogger? logger) {
         }
 
         /// <summary>
-        /// Validates that the polyline sequence meets the minimum required length.
-        /// Throws an <see cref="InvalidPolylineException"/> if the sequence is too short.
-        /// Optionally logs diagnostic messages if a logger is provided.
+        /// Validates that the polyline character sequence meets the minimum required length.
         /// </summary>
         /// <param name="polylineSequence">The polyline character sequence to validate.</param>
-        /// <param name="logger">Optional logger for diagnostic messages.</param>
+        /// <param name="logger">An optional <see cref="ILogger"/> used to log diagnostic messages when validation fails.</param>
         /// <exception cref="InvalidPolylineException">
         /// Thrown when <paramref name="polylineSequence"/> is shorter than the minimum allowed length.
         /// </exception>
@@ -161,8 +175,17 @@ private static void ValidateSequence(ReadOnlyMemory<char> polylineSequence, ILog
         }
 
         /// <summary>
-        /// Validates the polyline format for allowed characters.
+        /// Validates the format of the polyline character sequence, ensuring all characters are within the allowed range.
         /// </summary>
+        /// <param name="sequence">
+        /// The read-only memory region of characters representing the polyline to validate.
+        /// </param>
+        /// <param name="logger">
+        /// An optional <see cref="ILogger"/> used to log a warning when format validation fails.
+        /// </param>
+        /// <exception cref="ArgumentException">
+        /// Thrown when the polyline contains characters outside the valid encoding range or has an invalid block structure.
+        /// </exception>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         protected virtual void ValidateFormat(ReadOnlyMemory<char> sequence, ILogger? logger) {
             try {
@@ -174,9 +197,30 @@ protected virtual void ValidateFormat(ReadOnlyMemory<char> sequence, ILogger? lo
             }
         }
 
+        /// <summary>
+        /// Extracts the underlying read-only memory region of characters from the specified polyline instance.
+        /// </summary>
+        /// <param name="polyline">
+        /// The <typeparamref name="TPolyline"/> instance from which to extract the character sequence.
+        /// </param>
+        /// <returns>
+        /// A <see cref="ReadOnlyMemory{T}"/> of <see cref="char"/> representing the encoded polyline characters.
+        /// </returns>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         protected abstract ReadOnlyMemory<char> GetReadOnlyMemory(in TPolyline polyline);
 
+        /// <summary>
+        /// Creates a <typeparamref name="TCoordinate"/> instance from the specified latitude and longitude values.
+        /// </summary>
+        /// <param name="latitude">
+        /// The latitude component of the coordinate, in degrees.
+        /// </param>
+        /// <param name="longitude">
+        /// The longitude component of the coordinate, in degrees.
+        /// </param>
+        /// <returns>
+        /// A <typeparamref name="TCoordinate"/> instance representing the specified geographic coordinate.
+        /// </returns>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         protected abstract TCoordinate CreateCoordinate(double latitude, double longitude);
     }

src/PolylineAlgorithm/Abstraction/AbstractPolylineEncoder.cs

@@ -16,12 +16,14 @@ namespace PolylineAlgorithm.Abstraction;
 using System.Runtime.CompilerServices;
 
 /// <summary>
-/// Provides functionality to encode a collection of geographic coordinates into an encoded polyline string.
-/// Implements the <see cref="IPolylineEncoder{TCoordinate, TPolyline}"/> interface.
+/// Provides a base implementation for encoding sequences of geographic coordinates into encoded polyline strings.
 /// </summary>
 /// <remarks>
-/// This abstract class serves as a base for specific polyline encoders, allowing customization of the encoding process.
+/// Derive from this class to implement an encoder for a specific coordinate and polyline type. Override
+/// <see cref="GetLatitude"/>, <see cref="GetLongitude"/>, and <see cref="CreatePolyline"/> to provide type-specific behavior.
 /// </remarks>
+/// <typeparam name="TCoordinate">The type that represents a geographic coordinate to encode.</typeparam>
+/// <typeparam name="TPolyline">The type that represents the encoded polyline output.</typeparam>
 public abstract class AbstractPolylineEncoder<TCoordinate, TPolyline> : IPolylineEncoder<TCoordinate, TPolyline> {
     private readonly ILogger<AbstractPolylineEncoder<TCoordinate, TPolyline>> _logger;
     /// <summary>
@@ -68,8 +70,9 @@ protected AbstractPolylineEncoder(PolylineEncodingOptions options) {
     /// <exception cref="ArgumentException">
     /// Thrown when <paramref name="coordinates"/> is an empty enumeration.
     /// </exception>
-    /// <exception cref="InternalBufferOverflowException"></exception>
-    /// <exception cref="InvalidOperationException"></exception>
+    /// <exception cref="InvalidOperationException">
+    /// Thrown when the internal encoding buffer cannot accommodate the encoded value.
+    /// </exception>
     [System.Diagnostics.CodeAnalysis.SuppressMessage("Design", "MA0051:Method is too long", Justification = "Method contains local methods. Actual method only 55 lines.")]
     public TPolyline Encode(ReadOnlySpan<TCoordinate> coordinates) {
         const string OperationName = nameof(Encode);

src/PolylineAlgorithm/Extensions/PolylineDecoderExtensions.cs

@@ -28,7 +28,7 @@ public static class PolylineDecoderExtensions {
     /// An <see cref="IEnumerable{Coordinate}"/> containing the decoded latitude and longitude pairs.
     /// </returns>
     /// <exception cref="ArgumentNullException">
-    /// Thrown when <paramref name="decoder"/> is <see langword="null"/>.
+    /// Thrown when <paramref name="decoder"/> or <paramref name="polyline"/> is <see langword="null"/>.
     /// </exception>
     public static IEnumerable<Coordinate> Decode(this IPolylineDecoder<Polyline, Coordinate> decoder, string polyline) {
         if (decoder is null) {
@@ -51,7 +51,7 @@ public static IEnumerable<Coordinate> Decode(this IPolylineDecoder<Polyline, Coo
     /// An <see cref="IEnumerable{Coordinate}"/> containing the decoded latitude and longitude pairs.
     /// </returns>
     /// <exception cref="ArgumentNullException">
-    /// Thrown when <paramref name="decoder"/> is <see langword="null"/>.
+    /// Thrown when <paramref name="decoder"/> or <paramref name="polyline"/> is <see langword="null"/>.
     /// </exception>
     public static IEnumerable<Coordinate> Decode(this IPolylineDecoder<Polyline, Coordinate> decoder, char[] polyline) {
         if (decoder is null) {

src/PolylineAlgorithm/Extensions/PolylineEncoderExtensions.cs

@@ -1,4 +1,7 @@
-
+//
+// Copyright © Pete Sramek. All rights reserved.
+// Licensed under the MIT License. See LICENSE file in the project root for full license information.
+//
 
 namespace PolylineAlgorithm.Extensions;
 
@@ -15,19 +18,21 @@ namespace PolylineAlgorithm.Extensions;
 /// </summary>
 public static class PolylineEncoderExtensions {
     /// <summary>
-    /// Encodes a collection of <see cref="PolylineAlgorithm.Coordinate"/> instances into an encoded polyline.
+    /// Encodes a <see cref="List{T}"/> of <typeparamref name="TCoordinate"/> instances into an encoded polyline.
     /// </summary>
+    /// <typeparam name="TCoordinate">The type that represents a geographic coordinate to encode.</typeparam>
+    /// <typeparam name="TPolyline">The type that represents the encoded polyline output.</typeparam>
     /// <param name="encoder">
     /// The <see cref="IPolylineEncoder{TCoordinate, TPolyline}"/> instance used to perform the encoding operation.
     /// </param>
     /// <param name="coordinates">
-    /// The sequence of <see cref="PolylineAlgorithm.Coordinate"/> objects to encode.
+    /// The list of <typeparamref name="TCoordinate"/> objects to encode.
     /// </param>
     /// <returns>
-    /// A <see cref="PolylineAlgorithm.Polyline"/> representing the encoded polyline string for the provided coordinates.
+    /// A <typeparamref name="TPolyline"/> instance representing the encoded polyline for the provided coordinates.
     /// </returns>
     /// <exception cref="ArgumentNullException">
-    /// Thrown when <paramref name="encoder"/> is <see langword="null"/>.
+    /// Thrown when <paramref name="encoder"/> or <paramref name="coordinates"/> is <see langword="null"/>.
     /// </exception>
     [System.Diagnostics.CodeAnalysis.SuppressMessage("Design", "CA1002:Do not expose generic lists", Justification = "We need a list as we do need to marshal it as span.")]
     [System.Diagnostics.CodeAnalysis.SuppressMessage("Design", "MA0016:Prefer using collection abstraction instead of implementation", Justification = "We need a list as we do need to marshal it as span.")]
@@ -49,19 +54,21 @@ public static TPolyline Encode<TCoordinate, TPolyline>(this IPolylineEncoder<TCo
 
 
     /// <summary>
-    /// Encodes an array of <see cref="PolylineAlgorithm.Coordinate"/> instances into an encoded polyline.
+    /// Encodes an array of <typeparamref name="TCoordinate"/> instances into an encoded polyline.
     /// </summary>
+    /// <typeparam name="TCoordinate">The type that represents a geographic coordinate to encode.</typeparam>
+    /// <typeparam name="TPolyline">The type that represents the encoded polyline output.</typeparam>
     /// <param name="encoder">
     /// The <see cref="IPolylineEncoder{TCoordinate, TPolyline}"/> instance used to perform the encoding operation.
     /// </param>
     /// <param name="coordinates">
-    /// The array of <see cref="PolylineAlgorithm.Coordinate"/> objects to encode.
+    /// The array of <typeparamref name="TCoordinate"/> objects to encode.
     /// </param>
     /// <returns>
-    /// A <see cref="PolylineAlgorithm.Polyline"/> representing the encoded polyline string for the provided coordinates.
+    /// A <typeparamref name="TPolyline"/> instance representing the encoded polyline for the provided coordinates.
     /// </returns>
     /// <exception cref="ArgumentNullException">
-    /// Thrown when <paramref name="encoder"/> is <see langword="null"/>.
+    /// Thrown when <paramref name="encoder"/> or <paramref name="coordinates"/> is <see langword="null"/>.
     /// </exception>
     public static TPolyline Encode<TCoordinate, TPolyline>(this IPolylineEncoder<TCoordinate, TPolyline> encoder, TCoordinate[] coordinates) {
         if (encoder is null) {

src/PolylineAlgorithm/Internal/CoordinateDelta.cs

@@ -10,8 +10,10 @@ namespace PolylineAlgorithm.Internal;
 
 /// <summary>
 /// Represents the difference (delta) in latitude and longitude between consecutive geographic coordinates.
-/// This struct is used to compute and store the change in coordinate values as integer deltas.
 /// </summary>
+/// <remarks>
+/// This struct computes and stores the change in coordinate values as integer deltas between successive coordinates.
+/// </remarks>
 [DebuggerDisplay("{ToString(),nq}")]
 [StructLayout(LayoutKind.Auto)]
 internal struct CoordinateDelta {
@@ -39,7 +41,6 @@ public CoordinateDelta() {
     /// </summary>
     /// <param name="latitude">The next latitude value.</param>
     /// <param name="longitude">The next longitude value.</param>
-
     public void Next(int latitude, int longitude) {
         Latitude = Delta(_current.Latitude, latitude);
         Longitude = Delta(_current.Longitude, longitude);
@@ -57,7 +58,6 @@ public void Next(int latitude, int longitude) {
     /// <param name="initial">The previous coordinate value.</param>
     /// <param name="next">The next coordinate value.</param>
     /// <returns>The computed delta between <paramref name="initial"/> and <paramref name="next"/>.</returns>
-
     private static int Delta(int initial, int next) => next - initial;
 
     /// <summary>

src/PolylineAlgorithm/Internal/Defaults.cs

@@ -9,16 +9,18 @@ namespace PolylineAlgorithm.Internal;
 
 /// <summary>
 /// Provides default values and constants used throughout the Polyline Algorithm.
-/// Organizes defaults for algorithm parameters, polyline encoding, and geographic coordinates into nested static classes.
 /// </summary>
+/// <remarks>
+/// Organizes defaults for algorithm parameters, polyline encoding, and geographic coordinates into nested static classes.
+/// </remarks>
 [ExcludeFromCodeCoverage]
 internal static class Defaults {
     /// <summary>
     /// Contains default values and constants specific to the polyline encoding logging.
     /// </summary>
     internal static class Logging {
         /// <summary>
-        /// Log level multiplier used to distinguish event identification for each log level
+        /// Log level multiplier used to distinguish event identification for each log level.
         /// </summary>
         internal const int LogLevelMultiplier = 100;
     }
@@ -48,6 +50,9 @@ internal static class Algorithm {
         internal const byte UnitSeparator = 31;
     }
 
+    /// <summary>
+    /// Contains default values and constants for geographic coordinate validation.
+    /// </summary>
     internal static class Coordinate {
         /// <summary>
         /// Provides constants representing latitude values, including the default, minimum, and maximum valid values.
@@ -95,7 +100,7 @@ internal static class Polyline {
         /// </summary>
         internal static class Block {
             /// <summary>
-            /// Contains constants related to the length of encoded vakues in polyline encoding.
+            /// Contains constants related to the length of encoded values in polyline encoding.
             /// </summary>
             internal static class Length {
                 /// <summary>

src/PolylineAlgorithm/PolylineEncoding.cs

@@ -27,7 +27,7 @@ public static class PolylineEncoding {
     /// <remarks>
     /// <para>
     /// This method converts a floating-point coordinate value into a normalized integer by multiplying it by 10 raised
-    /// to the power of the specified precision, then rounding the result using the specified <paramref name="rounding"/> strategy.
+    /// to the power of the specified precision, then truncating the result to an integer.
     /// </para>
     /// <para>
     /// For example, with the default precision of 5:
@@ -211,7 +211,7 @@ public static bool TryReadValue(ref int delta, ReadOnlyMemory<char> buffer, ref
     /// more characters follow. The position is advanced as characters are written.
     /// </para>
     /// <para>
-    /// Before writing, the method validates that sufficient space is available in the buffer by calling <see cref="GetCharCount"/>.
+    /// Before writing, the method validates that sufficient space is available in the buffer by calling <see cref="GetRequiredBufferSize"/>.
     /// If the buffer does not have enough remaining capacity, the method returns <see langword="false"/> without modifying the buffer or position.
     /// </para>
     /// <para>